Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71a6cb7f8bb5781…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 19:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93c993a7056a652a4153323e365e1455 SHA-1: efba26a3580a624d2363a7f3b24b7bad24be033a SHA-256: e71a6cb7f8bb578195539c2df3aeb0102240570c73d5d0fd1d3ce892c94ad3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=cod+update+apk
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2895880---bamam.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/6835004898.pdf
    • http://oletrans.sk/editor_uploads/files/46823225821.pdf
    • https://rireenfrance.com/images/upload/files/7231346615.pdf
    • https://zzwgjx.com/d/files/kenudefogadipiwadav.pdf
    • http://hanasushipickup.com/uploads/files/35698061163.pdf
    • http://myflora888.com/ck_files/files/takexesigenixirinozom.pdf
    • http://ylphs.com/ckfinder/userfiles/files/71812154774.pdf
    • http://saltokisport.com/uploads/files/xopixusupibovonaleg.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fa0c91a5---53251714822.pdf
    • https://gymlesgeants.com/upload/editor/file/26065971786.pdf
    • http://studioingegneramato.com/userfiles/files/86677033661.pdf
    • http://tcsklife.com/filespath/files/20210913225653.pdf
    • https://alihuata.com/userfiles/file/63240266056.pdf
    • https://yourownadviser.com/ckfinder/userfiles/files/gekiponotejokexegilixojub.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/103onlejmrneeg1f4h6ljus16d/82790030325.pdf
    • http://okzawidow.pl/img/upload/files/wifiwefusupovalalapuguk.pdf
    • http://grgct.com/ckfinder/userfiles/files/28828009052.pdf
    • http://tubesealer.com/uploaded/file/1715497481613468469c3f5.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/42146374320.pdf
    • https://vntdc.com/upload/fck/file/vetigasagisogegozijajemob.pdf
    • http://denge.aero/upload/files/94648342202.pdf
    • https://pima-alarms.eu/slicice/file/32161111078.pdf
    • http://refinerlink.com/userfiles/file/feronowom.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/wuwaz.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/57968089327.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 16792 bytes
font_01_sfnt_off0000ecbe.bin
d4856324644ccadfeadada28f1affe1afbb452b90c0c33ee269245235b9f7fde
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 18756 bytes
font_02_sfnt_off00011d06.bin
f87f6727d1f3205898ca0613f4b8cdc02b0ef998b500976953a996da60584062
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 10096 bytes